问几道数学有理数计算①(-6)×(-0.25)×11/14②-7×(-3)×(-0.5)+(-12)×(-2.6)

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问几道数学有理数计算①(-6)×(-0.25)×11/14②-7×(-3)×(-0.5)+(-12)×(-2.6)问几道数学有理数计算①(-6)×(-0.25)×11/14②-7×(-3)×(-0.5

问几道数学有理数计算①(-6)×(-0.25)×11/14②-7×(-3)×(-0.5)+(-12)×(-2.6)
问几道数学有理数计算
①(-6)×(-0.25)×11/14
②-7×(-3)×(-0.5)+(-12)×(-2.6)

问几道数学有理数计算①(-6)×(-0.25)×11/14②-7×(-3)×(-0.5)+(-12)×(-2.6)
6×0.25×11/14
=3/2×11/14
=33/28 -7×3×0.5+12×2.6
=-10.5+31.2
=20.7

第一题28分之36第二题20.7

33/28
20.7

①(-6)×(-0.25)×11/14
=+(6×0.25)×11/14
=1.5×11/14
=33/28
②-7×(-3)×(-0.5)+(-12)×(-2.6)
=21×(-0.5)+(-12)×(-2.6)
=-10.5+(-12)×(-2.6)
=-10.5+31.2
=20.7
绝对正确